Terms in this set (31)
Study of how the genetic make up of a population changes over time
the total number of inheritable traits within a population
Percentage of each allele for a particular trait in a population
Frequencies of a particular allele remain constant in a population. (NO EVOLUTION)
-Under certain conditions, genetic equilibrium can exist
-If all conditions are not met, changes in the gene frequencies occur
-Heterotrophs came before autotrophs
-autotrophs developed using the CO2 released by heterotrophs
-Aerobic heterotrophs developed using the O2 released by autotrophs
first published ideas about the modern evolutionary theory.
Theory of Use and Disuse
if structure used, it will develop to be larger (NOT TRUE)
transmission of acquired traits
Characteristics acquired during an organisms lifetime can be passed to offspring (NOT TRUE)
Organisms with favorable variations survive, reproduce, and pass their variations to the next generation.
any variation that aids an organism's chance of survival.
evidence for evolution
fossils, anatomy, embryology, biochemistry
structural features with common evolutionary origin
body parts of organisms that do not have common evolutionary origin but are similar in function
a body structure that no long serves its original purpose.
shared features of the young embryos suggest a distant common ancestor
percentage of a specific allele in the gene pool.
Disrupting factors of genetic equilibrium
mutations, genetic drift, gene flow
change in allelic frequencies due to chance events
when individuals enter or leave a population
favors average individuals in a population
favors one extreme variation of a trait.
favors two extreme variations, eliminates intermediate phenotypes.
evolution of a new species
physical barrier divides a population
As populations become more different formerly interbreeding populations can no longer mate and produce fertile offspring
Changes Chromosome number due to mistakes during meiosis can result in new species
evolutionary changes are slow, gradual and continuous,
minor changes in populations
species are stable for long periods of time and then major changes (environmental) occur and a new species will evolve
Species that were once similar become increasingly different
Distantly related organisms evolve similar traits